NAME
Class::Accessor::Complex - Arrays, hashes, booleans, integers, sets and
more
VERSION
version 1.100880
SYNOPSIS
package MyClass;
use base 'Class::Accessor::Complex';
__PACKAGE__
->mk_new
->mk_array_accessors(qw(an_array))
->mk_hash_accessors(qw(a_hash))
->mk_integer_accessors(qw(an_integer))
->mk_class_hash_accessors(qw(a_hash))
->mk_set_accessors(qw(testset))
->mk_object_accessors('Some::Foo' => {
slot => 'an_object',
comp_mthds => [ qw(do_this do_that) ]
});
DESCRIPTION
This module generates accessors for your class in the same spirit as
Class::Accessor does. While the latter deals with accessors for scalar
values, this module provides accessor makers for arrays, hashes,
integers, booleans, sets and more.
As seen in the synopsis, you can chain calls to the accessor makers.
Also, because this module inherits from Class::Accessor, you can put a
call to one of its accessor makers at the end of the chain.
The accessor generators also generate documentation ready to be used
with Sub::Documentation.
METHODS
mk_new
Takes an array of strings as its argument. If no argument is given, it
uses "new" as the default. For each string it creates a constructor of
that name. The constructor accepts named arguments - that is, a hash -
and will set the hash values on the accessor methods denoted by the
keys. For example,
package MyClass;
use base 'Class::Accessor::Complex';
__PACKAGE__->mk_new;
package main;
use MyClass;
my $o = MyClass->new(foo => 12, bar => [ 1..5 ]);
is the same as
my $o = MyClass->new;
$o->foo(12);
$o->bar([1..5]);
The constructor will also call an "init()" method, if there is one.
mk_singleton
Takes an array of strings as its argument. If no argument is given, it
uses "new" as the default. For each string it creates a constructor of
that name.
This constructor only ever returns a single instance of the class. That
is, after the first call, repeated calls to this constructor return the
*same* instance. Note that the instance is instantiated at the time of
the first call, not before. Any arguments are treated as for "mk_new()".
Naturally, "init()" and any initializer methods are called only by the
first invocation of this method.
mk_scalar_accessors
Takes an array of strings as its argument. For each string it creates
methods as described below, where "*" denotes the slot name.
"*" This method can store a value in a slot and retrieve that value. If
it receives an argument, it sets the value. Only the first argument
is used, subsequent arguments are ignored. If called without a
value, the method retrieves the value from the slot.
*_clear, "clear_*"
Clears the value by setting it to undef.
mk_class_scalar_accessors
Takes an array of strings as its argument. For each string it creates
methods like those generated with "mk_scalar_accessors()", except that
it is a class scalar, i.e. shared by all instances of the class.
mk_concat_accessors
Takes an array of strings as its argument. For each string it creates
methods as described below, where "*" denotes the slot name.
"*" Like "mk_scalar_accessors()", but passing a value to the accessor
doesn't clear out the original value, but instead concatenates the
new value to the existing one. Thus, this kind of accessor is only
good for plain scalars.
*_clear, "clear_*"
Clears the value by setting it to undef.
mk_array_accessors
Takes an array of strings as its argument. For each string it creates
methods as described below, where "*" denotes the slot name.
"*" This method returns the list of values stored in the slot. If any
arguments are provided to this method, they *replace* the current
list contents. In an array context it returns the values as an array
and in a scalar context as a reference to the array. Note that this
reference is currently a direct reference to the storage; changes to
the storage will affect the contents of the reference, and
vice-versa. This behaviour is not guaranteed; caveat emptor.
*_push, "push_*"
Pushes the given elements onto the end of the array. Like perl's
"push()".
*_pop, "pop_*"
Pops one element off the end of the array. Like perl's "pop()".
*_shift, "shift_*"
Shifts one element off the beginning of the array. Like perl's
"shift()".
*_unshift, "unshift_*"
Unshifts the given elements onto the beginning of the array. Like
perl's "unshift()".
*_splice, "splice_*"
Takes an offset, a length and a replacement list. The arguments and
behaviour are exactly like perl's "splice()".
*_clear, "clear_*"
Deletes all elements of the array.
*_count, "count_*"
Returns the number of elements in the array.
*_set, "set_*"
Takes a list, treated as pairs of index => value; each given index
is set to the corresponding value. No return.
*_index, "index_*"
Takes a list of indices and returns a list of the corresponding
values. This is like an array slice.
mk_class_array_accessors
Takes an array of strings as its argument. For each string it creates
methods like those generated with "mk_array_accessors()", except that it
is a class hash, i.e. shared by all instances of the class.
mk_hash_accessors
Takes an array of strings as its argument. For each string it creates
methods as described below, where "*" denotes the slot name.
"*" Called with no arguments returns the hash stored in the slot, as a
hash in a list context or as a reference in a scalar context.
Called with one simple scalar argument it treats the argument as a
key and returns the value stored under that key.
Called with one array (list) reference argument, the array elements
are considered to be be keys of the hash. x returns the list of
values stored under those keys (also known as a *hash slice*.)
Called with one hash reference argument, the keys and values of the
hash are added to the hash.
Called with more than one argument, treats them as a series of
key/value pairs and adds them to the hash.
*_keys, "keys_*"
Returns the keys of the hash.
*_count, "count_*"
Returns the number of keys in the hash.
*_values, "values_*"
Returns the list of values.
*_exists, "exists_*"
Takes a single key and returns whether that key exists in the hash.
*_delete, "delete_*"
Takes a list and deletes each key from the hash.
*_clear, "clear_*"
Resets the hash to empty.
mk_class_hash_accessors
Takes an array of strings as its argument. For each string it creates
methods like those generated with "mk_hash_accessors()", except that it
is a class hash, i.e. shared by all instances of the class.
mk_abstract_accessors
Takes an array of strings as its argument. For each string it creates
methods as described below, where "*" denotes the slot name.
"*" When called, it either dies (if Error::Hierarchy is not installed)
or throws an exception of type
Error::Hierarchy::Internal::AbstractMethod (if it is installed).
mk_boolean_accessors
Takes an array of strings as its argument. For each string it creates
methods as described below, where "*" denotes the slot name.
"*" If given a true value - in the Perl sense, i.e. anything except
"undef", 0 or the empty string - it sets the slot's value to 1,
otherwise to 0. If no argument is given, it returns the slot's
value.
*_set, "set_*"
Sets the slot's value to 1.
*_clear, "clear_*"
Sets the slot's value to 0.
mk_integer_accessors
__PACKAGE__->mk_integer_accessors(qw(some_counter other_index));
Takes a list of accessor base names (simple strings). For each string it
creates methods as described below, where "*" denotes the accessor base
name.
"*" A basic getter/setter that stores an integer value. Actually, it can
store any value, but when read back, it returns 0 if the value is
undef.
*_reset, "reset_*"
Resets the slot's value to 0.
*_inc, "inc_*"
Increments the value, then returns it.
*_dec, "dec_*"
Decrements the value, then returns it.
Example:
package Foo;
use base 'Class::Accessor::Complex';
__PACKAGE__->mk_integer_accessors(qw(score));
Then:
my $obj = Foo->new(score => 150);
my $x = $obj->score_inc; # is now 151
$obj->score_reset; # is now 0
mk_set_accessors
Takes an array of strings as its argument. For each string it creates
methods as described below, where "*" denotes the slot name.
A set is different from a list in that it can contain every value only
once and there is no order on the elements (similar to hash keys, for
example).
"*" If called without arguments, it returns the elements in the set. If
called with arguments, it puts those elements into the set. As such,
it is a wrapper over "*_insert()" and "*_elements()".
*_insert, "insert_*"
Inserts the given elements (arguments) into the set. If you pass an
array reference as the first argument, it is being dereferenced and
used instead.
*_elements, "elements_*"
Returns the elements in the set.
*_delete, "delete_*"
Removes the given elements from the list. The order in which the
elements are returned is not guaranteed.
*_clear, "clear_*"
Empties the set.
*_contains, "contains_*"
Given an element, it returns whether the set contains the element.
*_is_empty, "is_empty_*"
Returns whether or not the set is empty.
*_size, "size_*"
Returns the number of elements in the set.
mk_object_accessors
MyClass->mk_object_accessors(
'Foo' => 'phooey',
'Bar' => [ qw(bar1 bar2 bar3) ],
'Baz' => {
slot => 'foo',
comp_mthds => [ qw(bar baz) ]
},
'Fob' => [
{
slot => 'dog',
comp_mthds => 'bark',
},
{
slot => 'cat',
comp_mthds => 'miaow',
},
],
);
The main argument should be a reference to an array. The array should
contain pairs of class => sub-argument pairs. The sub-arguments parsed
thus:
Hash Reference
See "Baz" above. The hash should contain the following keys:
"slot"
The name of the instance attribute (slot).
"comp_mthds"
A string or array reference, naming the methods that will be
forwarded directly to the object in the slot.
Array Reference
As for "String", for each member of the array. Also works if each
member is a hash reference (see "Fob" above).
String
The name of the instance attribute (slot).
For each slot "x", with forwarding methods "y()" and "z()", the
following methods are created:
"x" A get/set method, see "*" below.
"y" Forwarded onto the object in slot "x", which is auto-created via
"new()" if necessary. The "new()", if called, is called without
arguments.
"z" As for "y".
So, using the example above, a method, "foo()", is created, which can
get and set the value of those objects in slot "foo", which will
generally contain an object of class "Baz". Two additional methods are
created named "bar()" and "baz()" which result in a call to the "bar()"
and "baz()" methods on the "Baz" object stored in slot "foo".
Apart from the forwarding methods described above,
"mk_object_accessors()" creates methods as described below, where "*"
denotes the slot name.
"*" If the accessor is supplied with an object of an appropriate type,
will set set the slot to that value. Else, if the slot has no value,
then an object is created by calling "new()" on the appropriate
class, passing in any supplied arguments.
The stored object is then returned.
*_clear, "clear_*"
Removes the object from the accessor.
mk_forward_accessors
__PACKAGE__->mk_forward_accessors(
comp1 => 'method1',
comp2 => [ qw(method2 method3) ],
);
Takes a hash of mappings as its arguments. Each hash value is expected
to be either a string or an array reference. For each hash value an
accessor is created and forwarded to the accessor denoted by its
associated hash key.
In the example above, a call to "method1()" will be forwarded onto
"comp1()", and calls to "method2()" and "method3()" will be forwarded
onto "comp2()".
INSTALLATION
See perlmodinstall for information and options on installing Perl
modules.
BUGS AND LIMITATIONS
No bugs have been reported.
Please report any bugs or feature requests through the web interface at
.
AVAILABILITY
The latest version of this module is available from the Comprehensive
Perl Archive Network (CPAN). Visit to find a
CPAN site near you, or see
.
The development version lives at
. Instead of sending
patches, please fork this project using the standard git and github
infrastructure.
AUTHOR
Marcel Gruenauer
COPYRIGHT AND LICENSE
This software is copyright (c) 2007 by Marcel Gruenauer.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.